[10-serial-communication] Checking for tty (newer boards) not working due to extra dmesg output

[dennisschagt]

The check for detecting newer versions of the discovery board (dmesg | tail | grep -i tty) fails on my system.

I needed to run dmesg as root. Running it with sudo generated some extra log lines, pushing the cdc_acm 1-1:1.2: ttyACM0: USB ACM device out of the last 10 lines (default number of lines) returned by tail: